PACSystems™ RX3i and RSTi-EP CPU Reference Manual Section 6
GFK-2222AK October 2019
Serial I/O, SNP & RTU Protocols 143
Remote error — Error processing a remote command. The minor
error code identifies the error.
Number of bytes requested to read is greater than input
buffer size OR number bytes requested to write is zero
or greater than 250 bytes.
COMMREQ data block length is too small. String data is
missing or incomplete.
Receive timeout awaiting serial reception of data
Invalid CPU memory type specified.
Invalid CPU memory offset specified.
Unable to access CPU memory.
COMMREQ data block length too small.
Operating system service error. The operating system
service used to perform the request has returned an
error.
Port device error. The port device used to perform the
service has detected an error. Either a break was
received or a UART Error (parity, framing, overrun)
occurred.
Request cancelled. The request was terminated before
it could complete.
Serial output timeout. The serial port was unable to
transmit the string. (Could be due to missing CTS signal
when the serial port is configured to use hardware flow
control.)
Autodial Error — An error occurred while attempting to send a
command string to an attached external modem. The minor error
code identifies the specific error.
The modem command string length exceeds end of
reference memory type.
COMMREQ Data Block Length too small. Output
command string data missing or incomplete.
Serial output timeout. The serial port was unable to
transmit the modem autodial output.
Response was not received from modem. Check
modem and cable.
Modem responded with BUSY. Modem is unable to
complete the requested connection. The remote
modem is already in use; retry the connection request
later.
Modem responded with NO CARRIER. Modem is unable
to complete the requested connection. Check the local
and remote modems and the telephone line.
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